Effect of MTA-based sealer on the healing of periapical lesions

Some manufacturers have recently added specific components to improve the ease of handling and insertion material properties of MTA in order to create MTA-based sealers. Objective The aim of this study was to evaluate the healing of periapical lesions in canine teeth after a single session of endodontic treatment with MTA Fillapex® compared with Sealapex® or Endo-CPM-Sealer®. Material and Methods Sixty-two root canals were performed on two 1-year-old male dogs. After coronal access and pulp extirpation, the canals were exposed to the oral cavity for 6 months in order to induce periapical lesions. The root canals were prepared, irrigated with a solution of 2.5% sodium hypochlorite and filled with gutta-percha and different sealers, according to the following groups: 1) Sealapex®; 2) Endo-CPM-Sealer®; and 3) MTA Fillapex®. Some teeth with periapical lesions were left untreated for use as positive controls. Healthy teeth were used as negative controls. After 6 months, the animals were sacrificed and serial sections from the roots were prepared for histomorphologic analysis and stained with hematoxylin and eosin and the Brown and Brenn technique. The lesions were scored according to pre-established histomorphologic parameters and the scores statistically analyzed using the Kruskal-Wallis test. Results All 3 materials produced similar patterns of healing (p>0.05); in particular, persistent inflammation and absence of complete periapical tissue healing were consistently noted. Conclusions Preparation of the infected root canals followed by filling with the materials studied was insufficient to provide complete healing of the periapical tissues. .

Acurácia das medidas de limas endodônticas em radiografias digital e convencional: estudo in vitro em dentes decíduos / Conventional and digital endodontic files measurement accuracy: an in vitro on primary teeth

O presente estudo tem por objetivo avaliar a acurácia das medidas de limas endodônticas obtidas em radiografias digitais e convencionais de dentes decíduos. Para tanto, limas tipo K e Hedstroen calibre 20, com cursor registrando o comprimento aparente do dente, foram introduzidas no interior do canal de 18 incisivos decíduos extraídos, que foram radiografados pela técnica digital direta e convencional. Medidas da distância do cursor à extremidade apical da lima foram realizadas por um profissional treinado e repetidas no intervalo de uma semana, com auxílio de régua eletrônica na radiografia digital e paquímetro digital na radiografia convencional. Os dados obtidos foram analisados pelo teste de correlação de Pearson e teste t (p=0,05). A correlação entre o primeiro e o segundo exames foi r=0,99, independentemente do tipo de lima utilizado, tanto para a radiografia digital quanto para a convencional. Em relação ao tipo de lima, Kerr ou Hedströen, a concordância foi r=0,99 nos dois métodos radiográficos. Comparando-se as medidas obtidas na radiografia digital com as da convencional, a concordancia foi r=0,96 para as limas tipo K e r=0,95 para as limas Kedströen. Os valores de comprimento das limas na radiografia digital foram estatisticamente inferiores aos obtidos na radiografia convencional (p=0,02); no entanto, as medidas obtidas nos dois métodos radiográficos foram estatisticamente semelhantes ao compromisso real do dente tanto para as limas tipo K (p=0,029) quanto para as limas Heddströes (p=0,18). Conclui-se que a radiografia digital se mostrou um método confiável para obtenção do comprimento de limas endodônticas

Digital versus conventional radiography for determination of primary incisor length

Aim: This in vitro study evaluated the accuracy of primary incisor lengths determined by digital and conventional radiography compared to the actual tooth length. Methods: Twenty extracted primary maxillary incisors were mounted in acrylic blocks. Tooth length was estimated by using a straight-line measurement provided by the distance measurement tool of a digital dental imaging system (Computed Dental Radiography, Schick Technologies Inc.) and conventional E-speed film radiographs by using a digital caliper. Two operators familiar with both radiographic methods performed the estimates. The estimated tooth lengths were compared to the actual tooth lengths measured with the digital caliper. Data were statistically analyzed by Dahlberg’s equation, paired t test, Pearson’s correlation coefficient and ANOVA at 5% significance level. Results: There were no statistically significant differences (p = 0.85) between tooth length estimated on digital and conventional radiographs. Admitting as clinically acceptable a 0.5-mm discrepancy between the actual tooth lengths and the radiographically estimated lengths, 60% of the radiographic measurements were considered as accurate. When the acceptable difference range was 1.0 mm, the accuracy of the radiographic measurements increased to 100%. Conclusions: Digital and conventional radiography provided similar tooth length measurements and were equivalent to the actual tooth lengths.

Amálgama convencional X amálgama adesivo - relato de caso em molares decíduos de um mesmo paciente / Amalgama X bonding amalgam - clinical observation in deciduous teeth

Os autores relatam o controle clínico, radiográfico e o aspecto microscópico após a esfoliação, de uma restauração de amálgama convencional e uma de amálgama aderido às estruturas dentárias com Panávia EX em molares decíduos